We should make the client setting of iat-mode match the server setting. (If the two sides do not have the same setting, the connection will still work, but only one direction will be using the packet size and timing obfuscation.)

Thanks (especially for the testing)! This is fixed on master, maint-6.0 and hardened-builds (commits 6382cb570c228463e48c49291c72e128131d9cd9, c692d3d162088f8b645ea5fec6ef05d57116c00c, and 1cab20e4122796a020c71961f0648d07dc25692f).